83.It is not clear________he did it.

A.who　　　　　　 B.which　　　　　　　　 C.whom　　　　 D.why

82.Has it been announced________the planes are to take off?

A.when　　　　　 B.if　　　　　　　　　　　 C.which　　　　 D.what

81.________ the headmaster is not coming to the sports meeting at all.

A.It seems that　　　　　　　 B.It seem that　　　　 C.It seems　　　 D.It seemed

80.________ you’ve all had a wonderful vacation.

A.It would be good that　　　　　　　 B.It is good that

C.It was good that　　　　　　　　　　　 D.It will be good that

79.________ they don’t like us is very clear.

A.What　　　　　 B.That　　　　　　　　　 C.Which　　　　 D.Where

78.The suggestion________students should learn some practical knowledge is worth considering.

A.if　　　　　　　 B.which　　　　　　　　 C.不填　　　　　 D.that

77.She dresses well，but the trouble is________the clothes she is wearing don’t go with each other very well.

A.even if　　　　 B.whether　　　　　　　 C.that　　　　　　 D.if

76.After months of research there was little hope________the lost car might be found.

A.that　　　　　　 B.which　　　　　　　　 C.when　　　　　 D.how

75.It looks________he is unhappy today.

A.that　　　　　　 B.if　　　　　　　　　　　 C.as if　　　　　　 D.whether

74.The fire destroyed________was in the building.

A.all　　　　　　　　　　 B.what　　　　　 C.that　　　　　　 D.which